Prosecutor Sean Guerin read out the interview memos as the arresting officer, Detective Sergeant Peter Woods, was giving evidence in the trial.

Mr Dwyer (42), an architect of Kerrymount Close, Foxrock, is pleading not guilty to the murder of Ms O'Hara (36), a childcare assistant, at Killakee, Rathfarnham, on August 22, 2012. Her remains were found by a dog walker in undergrowth in the Dublin mountains on September 13, 2013.

The prosecution maintains Mr Dwyer killed her for his own sexual gratification.

Det Sgt Woods said he went to the home of the accused on October 17, 2013 to arrest Mr Dwyer. He arrived at 7.08am. Mr Dwyer was arrested on suspicion of the murder of Elaine O'Hara.

He told gardai he was aware that her body had been found having read it online. They discussed his family, his model plane flying hobby and his pay cuts before Det Sgt Woods introduced the subject of garda work and DNA analysis.

"I am not going to be dressed up to match your profile. I am concerned about why I am here. I didn't kill anybody," he said, adding that he was thinking about his wife and kids.

Mr Dwyer said an "old school friend" was the only person he knew in Stepaside. He was then shown a picture of Ms O'Hara and said: "I see that. I won't tell any lies and I won't give any mistruths. I'm not a killer, I'm not a saint."

Asked about his phone "pinging" off masts in south Dublin, he said: "I've probably been in most shops in Stepaside, Dun Laoghaire and Monkstown."

The numbers of the so-called "Master" and "Slave" phones were then read to him and he denied knowing "anything about Master and Slave".

He was then told about Ms O'Hara's iPhone having been synced and text messages had been recovered. A large number of these, featuring references to violence, murder, stabbing and rape, were read to him.

"Jesus," Mr Dwyer replied several times "Please stop" and "Oh my God" and repeatedly "That is not me."

It was put to him that "Graham's number" was entered in Ms O'Hara's diary with the 083 1103474 number and he said: "It's not me, I can't explain that, that is my name, it's not my phone, it doesn't make sense."

"You have a stabbing fetish, don't you?" he was asked, and he replied: "Oh my God, that is not my phone."

He was then asked what he had been looking at on his computer the night before his arrest and he said: "Horror scenes from horror movies. Erotic horror, it's sort of art, to do with horror. Please stop. I am thinking of my wife and kids.